Solvent/Surfactant Well Stimulations

SPE Member This paper describes a method to optimize well stimulation treatments using a combination of solvent and surfactant with a jet washing tool to clean clogged liners and perforations. The well selection criteria perforations. The well selection criteria using geologic and production data have been developed to maximize project profitability. The jet tool is used to selectively place the chemicals in an underpressured reservoir across a large (350-foot plus) completed interval. The chemical used for these jobs is xylene and a nonionic surfactant/demulsifier. The surfactant is mutually soluble in hydrocarbon and water. Xylene acts as a carrier for the surfactant and solubilizes asphaltenes. This combination of xylene and surfactant breaks emulsions and makes the gravel pack and/or formation near the wellbore water-wet. Twenty-seven wells have been stimulated in the North Midway Sunset Field. The optimal concentration range of surfactant was found to be between 9 and 14%. Treatments using surfactant concentrations in this range have rapid payout. P. 603